Question re seat reservation when booking through Finnair - I'm looking to book JL43 and 44 on the Finnair site but I can't find a clear answer re. seat reservation. Will likely be doing J and F and doing a dummy booking I can see I won't be able to reserve seats through Finnair but will I be able to reserve on JAL site after booking? Or will I need to call JAL to get it done? Or is it only going to be available at online check in?

Appreciate any info!